Hmmm....now there is a good question! I don't believe it is sold at Wal-Mart/Target type stores. I will do some research and see what I can find.

Ok...here is what I have found. Camping/survival stores will probably sell it as well as gun stores. I found several links online to places to buy pepper spray/mace key rings. Here are just a few:

http://www.mystunguns.com/12ozpeshpesp.html
http://www.laswholesale.com/view/29/30/
http://www.pentagondefense.com/5041000.html
http://www.beststungun.com/mace-pepp...-keychain.html

I don't know much about mace...as in how close you have to be etc...however, I did experience pepper spray in high school. Some idiot sprayed it in the band room during band camp one summer. He was on the other side of a 20ft. room and I still thought I was going to die. Powerful stuff.